In situ EXAFS study of the bimetallic interaction in a rhenium-promoted alumina-supported cobalt Fischer–Tropsch catalyst

Authors: Rønning M.¹; Nicholson D.G.²; Holmen A.³

Source: Catalysis Letters, Volume 72, Numbers 3-4, April 2001 , pp. 141-146(6)

Publisher: Springer

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Abstract:

The local environments about the rhenium atoms in a Co–Re/ gamma -Al_2O_3 catalyst after different reduction periods have been studied by X-ray absorption spectroscopy (EXAFS). The bimetallic catalyst containing 4.6 wt% cobalt and 2 wt% rhenium has been compared with a corresponding monometallic sample with 2 wt% rhenium on the same support. The rhenium L_III EXAFS analysis shows that bimetallic particles are formed after reduction at 450 ^○C with the average particle size being less than 15 Å. More than 6 h reduction at 450 ^○C is required for complete reduction of accessible rhenium.

Keywords: Fischer–Tropsch catalyst; bimetallic interaction; EXAFS; rhenium promoter; cobalt catalyst

Language: English

Document Type: Regular paper

Affiliations: 1: Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway 2: Department of Chemistry, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway 3: Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway E-mail: holmen@chembio.ntnu.no

Publication date: 2001-04-01